Encryption Algorithms

Here you can find a detailed description of the encryption algorithms currently used in PrivateGSM products, with the Open protocols described previously.

The encryption algorithms are the fundamental building blocks of encryption protocols, that when adapted with telecommunication protocols, allow the creation of Secure Encrypted telecommunication technologies.

ZRTP, SRTP and SIP/TLS use only the best symmetric and asymmetric encryption and hashing algorithms.

• ZRTP uses AES256 in counter mode (CTR) for symmetric encryption in compliance with FIPS 197 security requirements and ECDH 384bit for asymmetric encryption DH key exchange in compliance with USA NSA Suite B security requirements, NIST SP800-56A standard and ECDSA FIPS 186-3. It can be configured to use also other ZRTP supported encryption algorithms for compatibility with a ZRTP-supporting third party software such as ECDH 521bit or DH3072 .
• SRTP employs AES128 in counter mode (CTR) key agreement system, with keys agreed by parties across the TLS protected SIP channel through the PBX.
• TLS employs AES128 to encipher the SIP connection symmetrically given the verification of a x509v3 digital certificate whose RSA key is 2048bit.